Molybdenum disulfide nanoparticles decorated reduced graphene oxide: highly sensitive and selective hydrogen sensor.

In this work, we report on the hydrogen (H) sensing behavior of reduced graphene oxide (RGO)/molybdenum disulfide (MoS) nano particles (NPs) based composite film. The RGO/MoS composite exhibited a highly enhanced H response (∼15.6%) for 200 ppm at an operating temperature of 60 °C. Furthermore, the RGO/MoS composite showed excellent selectivity to H with respect to ammonia (NH) and nitric oxide (NO) which are highly reactive gas species. The composite's response to H is 2.9 times higher than that of NH whereas for NO it is 3.5. This highly improved H sensing response and selectivity of RGO/MoS at low operating temperatures were attributed to the structural integration of MoS nanoparticles in the nanochannels and pores in the RGO layer.